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while(<ASUBFILE>){ unless (/^[A-Za-z0-9 other expected chars]*$/) { ... } $strASub .= $_; }
$;=sub{$/};@;=map{my($a,$b)=($_,$;);$;=sub{$a.$b->()}} split//,".rekcah lreP rehtona tsuJ";$\=$ ;->();print$/